1620545536 has 117 divisors (see below), whose sum is σ = 3538094259. Its totient is φ = 741998592.

The previous prime is 1620545513. The next prime is 1620545557. The reversal of 1620545536 is 6355450261.

The square root of 1620545536 is 40256.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 753831936 + 866713600 = 27456^2 + 29440^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1620545495 and 1620545504.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 43798510 + ... + 43798546.

Almost surely, 2^1620545536 is an apocalyptic number.

1620545536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1620545536 is the 40256-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1620545536

1620545536 is an abundant number, since it is smaller than the sum of its proper divisors (1917548723).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1620545536 is an frugal number, since it uses more digits than its factorization.

1620545536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 56 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 37.

The cubic root of 1620545536 is about 1174.5921109646.

Adding to 1620545536 its reverse (6355450261), we get a palindrome (7975995797).

The spelling of 1620545536 in words is "one billion, six hundred twenty million, five hundred forty-five thousand, five hundred thirty-six".